40 lines
1.4 KiB
Plaintext
40 lines
1.4 KiB
Plaintext
G = ({program, statement_list, statement, assignment_stmt, input_stmt, output_stmt, if_stmt, for_stmt, array_decl_stmt, condition, increment_stmt, expression, term, factor, relational_operator, binary_operator, concatenation},{=, (, ), [, ], if, else, for, ARRAY, echo, readline, +, -, *, /, <, <=, ==, >=, !=, ++, --, :, ;, IDENTIFIER, INTEGER_CONST, FLOAT_CONST, STRING_CONST},P, program)
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P :
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program -> statement_list
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statement_list -> statement | statement statement_list
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statement -> assignment_stmt | input_stmt | output_stmt | if_stmt | for_stmt | array_decl_stmt
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assignment_stmt -> IDENTIFIER = expression
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input_stmt -> IDENTIFIER = readline_function ( STRING_CONST )
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output_stmt -> echo_function ( STRING_CONST concatenation IDENTIFIER )
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if_stmt -> if ( condition ) : statement | if ( condition ) : statement else : statement
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for_stmt -> for ( assignment_stmt ; condition ; increment_stmt ) : statement
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array_decl_stmt -> IDENTIFIER = ARRAY [ INTEGER_CONST ]
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condition -> expression relational_operator expression
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increment_stmt -> IDENTIFIER ++ | IDENTIFIER --
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expression -> term | term binary_operator expression
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term -> factor | factor binary_operator term
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factor -> IDENTIFIER | INTEGER_CONST | FLOAT_CONST | STRING_CONST
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relational_operator -> < | <= | == | >= | !=
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binary_operator -> + | - | * | /
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concatenation -> +
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echo_function -> echo
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readline_function -> readline |